you can probably swap the card without problems. what will most likely happen is the pictures will be put in the dcim folder under a different naming scheme or a whole new folder completely. i use my sd card between my xp computer, treo, ipaq, and digital cameras (none kodak though) and i have no problems.
the formatting on the card will matter, but the treo only supports FAT- and most likely if you can read the card on the treo, it will be read on the camera. windows mobile and xp support fat32 and that format is not always supported on cameras

you are correct Ken. The card can be moved back and forth with no problem. I have a 1gb card. kodak camera, nikon camera, and a treo 650 and I move the card between all of them and my pc with no problems.

correct- you need to format the card first- i suggested in the treo because it will be formatted FAT which is the lowest common denominator between most devices. do NOT format the card when you know there is data on it- as aprasad has stated